The logistical pipe now connect to the lower part of the digital miner and items don't go to the chest (see videos).

Non working version :
Mekanism-1.12.2-9.6.7.360.jar
https://youtu.be/BNPap4-jxNs

Working version :
Mekanism-1.12.2-9.6.5.357.jar
https://youtu.be/aa89pOcb7m0

Odd, this should be fixed post-Mekanica merge though. Try not letting the pipe touch the miner?

I tried, same thing. Items are going back and forth the fisrt pipe.

I had a similar problem with the digital miner using Mekanism-1-12-2-9-6-7-359.jar
The miner produced way too much ore output. For example, with three speed upgrades, the miner added one ore per second into its internal storage, but at the rear panel the miner produced an output of about 16 ores per second. That are not exact numbers, but its for sure a bug. Second, after the internal storage was full, the miner stopped counting down the remaining ores, as if there were infinite ores out there. I tried then the 357 version, like lebanni recommended and the miner output was normal.
I use the latest forge 14.23.5.2824, because one mod(industrial foregoing), has problems with the recommended older forge.

The dupe bug should be fixed in the latest release, but that's separate from this auto eject issue

v9.6.8.366.
Sorry, but still not working. I also tried v9.6.6.358. v9.6.5.357 is the latest working version.

This hasn't been merged to the master branch yet

Should be fixed as of this release: https://minecraft.curseforge.com/projects/mekanism/files/2698323